Romero will be remembered best for co-writing (with John A. Russo) and directing “Night of the Living Dead,” which showed later generations of filmmakers such as Tobe Hooper and John Carpenter that generating big scares didn’t require big budgets. “Living Dead” spawned an entire school of zombie knockoffs, and Romero’s own sequels were 1978’s “Dawn of the Dead,” 1985’s “Day of the Dead,” 2005’s “Land of the Dead,” 2007’s “Diary of the Dead” and 2009’s “George A. Romero’s Survival of the Dead.”